AWS Technical Essentials Practice

The purpose of the “multi-AZ” deployment model in Amazon RDS is to enhance availability through replication across availability zones. In a multi-AZ deployment, Amazon RDS automatically creates a primary database instance and synchronously replicates the data to a standby instance in another availability zone. This setup protects against the failure of the primary instance or the underlying infrastructure by ensuring that there is a failover option available.

When the primary instance becomes unavailable, Amazon RDS automatically switches to the standby instance without the need for user intervention. This capability significantly increases database availability and helps maintain application performance and reliability. The multi-AZ deployment model is particularly beneficial for critical applications where it is essential to minimize downtime and ensure high availability.

The other options do not align with the specific function of the multi-AZ model: scaling processing power is related to read replicas, backup automation is typically handled through manual or automated snapshot processes rather than being tied to availability zones, and user interface management is offered by database administration tools rather than being a specific feature of the multi-AZ deployment.